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Commit | Line | Data |
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3947be19 DH |
1 | /* |
2 | * linux/mm/memory_hotplug.c | |
3 | * | |
4 | * Copyright (C) | |
5 | */ | |
6 | ||
3947be19 DH |
7 | #include <linux/stddef.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/swap.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/bootmem.h> | |
13 | #include <linux/compiler.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/pagevec.h> | |
2d1d43f6 | 16 | #include <linux/writeback.h> |
3947be19 DH |
17 | #include <linux/slab.h> |
18 | #include <linux/sysctl.h> | |
19 | #include <linux/cpu.h> | |
20 | #include <linux/memory.h> | |
21 | #include <linux/memory_hotplug.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/vmalloc.h> | |
0a547039 | 24 | #include <linux/ioport.h> |
38837fc7 | 25 | #include <linux/cpuset.h> |
3947be19 DH |
26 | |
27 | #include <asm/tlbflush.h> | |
28 | ||
45e0b78b KM |
29 | /* add this memory to iomem resource */ |
30 | static struct resource *register_memory_resource(u64 start, u64 size) | |
31 | { | |
32 | struct resource *res; | |
33 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
34 | BUG_ON(!res); | |
35 | ||
36 | res->name = "System RAM"; | |
37 | res->start = start; | |
38 | res->end = start + size - 1; | |
39 | res->flags = IORESOURCE_MEM; | |
40 | if (request_resource(&iomem_resource, res) < 0) { | |
41 | printk("System RAM resource %llx - %llx cannot be added\n", | |
42 | (unsigned long long)res->start, (unsigned long long)res->end); | |
43 | kfree(res); | |
44 | res = NULL; | |
45 | } | |
46 | return res; | |
47 | } | |
48 | ||
49 | static void release_memory_resource(struct resource *res) | |
50 | { | |
51 | if (!res) | |
52 | return; | |
53 | release_resource(res); | |
54 | kfree(res); | |
55 | return; | |
56 | } | |
57 | ||
58 | ||
53947027 | 59 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
718127cc | 60 | static int __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
61 | { |
62 | struct pglist_data *pgdat = zone->zone_pgdat; | |
63 | int nr_pages = PAGES_PER_SECTION; | |
64 | int nid = pgdat->node_id; | |
65 | int zone_type; | |
66 | ||
67 | zone_type = zone - pgdat->node_zones; | |
718127cc YG |
68 | if (!populated_zone(zone)) { |
69 | int ret = 0; | |
a2f3aa02 DH |
70 | ret = init_currently_empty_zone(zone, phys_start_pfn, |
71 | nr_pages, MEMMAP_HOTPLUG); | |
718127cc YG |
72 | if (ret < 0) |
73 | return ret; | |
74 | } | |
a2f3aa02 DH |
75 | memmap_init_zone(nr_pages, nid, zone_type, |
76 | phys_start_pfn, MEMMAP_HOTPLUG); | |
718127cc | 77 | return 0; |
3947be19 DH |
78 | } |
79 | ||
3947be19 DH |
80 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
81 | { | |
3947be19 | 82 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
83 | int ret; |
84 | ||
ebd15302 KH |
85 | if (pfn_valid(phys_start_pfn)) |
86 | return -EEXIST; | |
87 | ||
0b0acbec | 88 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
89 | |
90 | if (ret < 0) | |
91 | return ret; | |
92 | ||
718127cc YG |
93 | ret = __add_zone(zone, phys_start_pfn); |
94 | ||
95 | if (ret < 0) | |
96 | return ret; | |
97 | ||
3947be19 DH |
98 | return register_new_memory(__pfn_to_section(phys_start_pfn)); |
99 | } | |
100 | ||
101 | /* | |
102 | * Reasonably generic function for adding memory. It is | |
103 | * expected that archs that support memory hotplug will | |
104 | * call this function after deciding the zone to which to | |
105 | * add the new pages. | |
106 | */ | |
107 | int __add_pages(struct zone *zone, unsigned long phys_start_pfn, | |
108 | unsigned long nr_pages) | |
109 | { | |
110 | unsigned long i; | |
111 | int err = 0; | |
6f712711 KH |
112 | int start_sec, end_sec; |
113 | /* during initialize mem_map, align hot-added range to section */ | |
114 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
115 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
3947be19 | 116 | |
6f712711 KH |
117 | for (i = start_sec; i <= end_sec; i++) { |
118 | err = __add_section(zone, i << PFN_SECTION_SHIFT); | |
3947be19 | 119 | |
6f712711 KH |
120 | /* |
121 | * EEXIST is finally dealed with by ioresource collision | |
122 | * check. see add_memory() => register_memory_resource() | |
123 | * Warning will be printed if there is collision. | |
bed120c6 JS |
124 | */ |
125 | if (err && (err != -EEXIST)) | |
3947be19 | 126 | break; |
6f712711 | 127 | err = 0; |
3947be19 DH |
128 | } |
129 | ||
130 | return err; | |
131 | } | |
bed120c6 | 132 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 DH |
133 | |
134 | static void grow_zone_span(struct zone *zone, | |
135 | unsigned long start_pfn, unsigned long end_pfn) | |
136 | { | |
137 | unsigned long old_zone_end_pfn; | |
138 | ||
139 | zone_span_writelock(zone); | |
140 | ||
141 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
142 | if (start_pfn < zone->zone_start_pfn) | |
143 | zone->zone_start_pfn = start_pfn; | |
144 | ||
25a6df95 YG |
145 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
146 | zone->zone_start_pfn; | |
3947be19 DH |
147 | |
148 | zone_span_writeunlock(zone); | |
149 | } | |
150 | ||
151 | static void grow_pgdat_span(struct pglist_data *pgdat, | |
152 | unsigned long start_pfn, unsigned long end_pfn) | |
153 | { | |
154 | unsigned long old_pgdat_end_pfn = | |
155 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
156 | ||
157 | if (start_pfn < pgdat->node_start_pfn) | |
158 | pgdat->node_start_pfn = start_pfn; | |
159 | ||
25a6df95 YG |
160 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
161 | pgdat->node_start_pfn; | |
3947be19 DH |
162 | } |
163 | ||
164 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
165 | { | |
166 | unsigned long i; | |
167 | unsigned long flags; | |
168 | unsigned long onlined_pages = 0; | |
2842f114 KH |
169 | struct resource res; |
170 | u64 section_end; | |
171 | unsigned long start_pfn; | |
3947be19 | 172 | struct zone *zone; |
6811378e | 173 | int need_zonelists_rebuild = 0; |
3947be19 DH |
174 | |
175 | /* | |
176 | * This doesn't need a lock to do pfn_to_page(). | |
177 | * The section can't be removed here because of the | |
178 | * memory_block->state_sem. | |
179 | */ | |
180 | zone = page_zone(pfn_to_page(pfn)); | |
181 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
182 | grow_zone_span(zone, pfn, pfn + nr_pages); | |
183 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); | |
184 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
185 | ||
6811378e YG |
186 | /* |
187 | * If this zone is not populated, then it is not in zonelist. | |
188 | * This means the page allocator ignores this zone. | |
189 | * So, zonelist must be updated after online. | |
190 | */ | |
191 | if (!populated_zone(zone)) | |
192 | need_zonelists_rebuild = 1; | |
193 | ||
2842f114 KH |
194 | res.start = (u64)pfn << PAGE_SHIFT; |
195 | res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1; | |
196 | res.flags = IORESOURCE_MEM; /* we just need system ram */ | |
197 | section_end = res.end; | |
198 | ||
58c1b5b0 | 199 | while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) { |
2842f114 KH |
200 | start_pfn = (unsigned long)(res.start >> PAGE_SHIFT); |
201 | nr_pages = (unsigned long) | |
202 | ((res.end + 1 - res.start) >> PAGE_SHIFT); | |
203 | ||
204 | if (PageReserved(pfn_to_page(start_pfn))) { | |
205 | /* this region's page is not onlined now */ | |
206 | for (i = 0; i < nr_pages; i++) { | |
207 | struct page *page = pfn_to_page(start_pfn + i); | |
208 | online_page(page); | |
209 | onlined_pages++; | |
210 | } | |
211 | } | |
212 | ||
213 | res.start = res.end + 1; | |
214 | res.end = section_end; | |
3947be19 DH |
215 | } |
216 | zone->present_pages += onlined_pages; | |
f2937be5 | 217 | zone->zone_pgdat->node_present_pages += onlined_pages; |
3947be19 | 218 | |
61b13993 DH |
219 | setup_per_zone_pages_min(); |
220 | ||
6811378e YG |
221 | if (need_zonelists_rebuild) |
222 | build_all_zonelists(); | |
5a4d4361 | 223 | vm_total_pages = nr_free_pagecache_pages(); |
2d1d43f6 | 224 | writeback_set_ratelimit(); |
3947be19 DH |
225 | return 0; |
226 | } | |
53947027 | 227 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 228 | |
9af3c2de YG |
229 | static pg_data_t *hotadd_new_pgdat(int nid, u64 start) |
230 | { | |
231 | struct pglist_data *pgdat; | |
232 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
233 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
234 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
235 | ||
236 | pgdat = arch_alloc_nodedata(nid); | |
237 | if (!pgdat) | |
238 | return NULL; | |
239 | ||
240 | arch_refresh_nodedata(nid, pgdat); | |
241 | ||
242 | /* we can use NODE_DATA(nid) from here */ | |
243 | ||
244 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
245 | free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); | |
246 | ||
247 | return pgdat; | |
248 | } | |
249 | ||
250 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
251 | { | |
252 | arch_refresh_nodedata(nid, NULL); | |
253 | arch_free_nodedata(pgdat); | |
254 | return; | |
255 | } | |
256 | ||
0a547039 | 257 | |
bc02af93 YG |
258 | int add_memory(int nid, u64 start, u64 size) |
259 | { | |
9af3c2de YG |
260 | pg_data_t *pgdat = NULL; |
261 | int new_pgdat = 0; | |
ebd15302 | 262 | struct resource *res; |
bc02af93 YG |
263 | int ret; |
264 | ||
ebd15302 KH |
265 | res = register_memory_resource(start, size); |
266 | if (!res) | |
267 | return -EEXIST; | |
268 | ||
9af3c2de YG |
269 | if (!node_online(nid)) { |
270 | pgdat = hotadd_new_pgdat(nid, start); | |
271 | if (!pgdat) | |
272 | return -ENOMEM; | |
273 | new_pgdat = 1; | |
274 | ret = kswapd_run(nid); | |
275 | if (ret) | |
276 | goto error; | |
277 | } | |
278 | ||
bc02af93 YG |
279 | /* call arch's memory hotadd */ |
280 | ret = arch_add_memory(nid, start, size); | |
281 | ||
9af3c2de YG |
282 | if (ret < 0) |
283 | goto error; | |
284 | ||
0fc44159 | 285 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
286 | node_set_online(nid); |
287 | ||
38837fc7 PJ |
288 | cpuset_track_online_nodes(); |
289 | ||
0fc44159 YG |
290 | if (new_pgdat) { |
291 | ret = register_one_node(nid); | |
292 | /* | |
293 | * If sysfs file of new node can't create, cpu on the node | |
294 | * can't be hot-added. There is no rollback way now. | |
295 | * So, check by BUG_ON() to catch it reluctantly.. | |
296 | */ | |
297 | BUG_ON(ret); | |
298 | } | |
299 | ||
9af3c2de YG |
300 | return ret; |
301 | error: | |
302 | /* rollback pgdat allocation and others */ | |
303 | if (new_pgdat) | |
304 | rollback_node_hotadd(nid, pgdat); | |
ebd15302 KH |
305 | if (res) |
306 | release_memory_resource(res); | |
9af3c2de | 307 | |
bc02af93 YG |
308 | return ret; |
309 | } | |
310 | EXPORT_SYMBOL_GPL(add_memory); |